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Optivus agrammus, Western roughy
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Western roughy
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drawing shows typical species in Trachichthyidae.
Teleostei (teleosts) >
Trachichthyiformes
(Roughies) >
Trachichthyidae
(Slimeheads)
Etymology:
Optivus:
Latin, optivus, -a-um = chosen
;
agrammus:
Named for the absence ot stripes on the caudal fin (Greek 'a' for without and 'gramme' for line).
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; reef-associated; depth range 40 - 320 m (Ref.
76814
). Temperate
Eastern Indian Ocean: Australia.
Size / Weight / Age
Maturity: L
m
?
range ? - ? cm
Max length : 9.1 cm SL male/unsexed; (Ref.
76814
)
Short description
Morphology
|
Morphometrics
Dorsal
spines
(total): 3;
Dorsal
soft rays
(total): 10-11;
Anal
spines
: 3;
Anal
soft rays
: 9 - 10;
Vertebrae
: 26. This species is distinguished by the following characters: 20-24 (modally 22) gill rakers; gently curved lateral profile of nape and dorsal surface of head, nearly horizontal in front of dorsal-fin origin, almost straight between eyes; broadly rounded tip of snout; 2.7-2.9 times in SL, depth of head at vertical through upper end of gill opening; snout length is 1.5-2.6 times in eye diameter; the inner row of teeth on premaxilla is noticeably longer than others; relatively short and deep caudal peduncle, depth 0. 9-1.2 in length; dorsal and anal fins are relatively low, third segmented dorsal-fin ray 3.8-4.6 times in SL, first anal-fin ray 5.6-8.2 times in SL; body color greenish brown on back, silvery below; fins almost uniformly pink, though slightly dusky tips to caudal-fin lobes lasting in recently preserved large specimens (Ref.
76814
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Gomon, M.F.
, 2004. Two new species of roughy (Trachichthyidae:
Optivus
) from coastal waters of southern Australia. Rec. Aust. Mus. 56:173-178. (Ref.
76814
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
26 December 2019
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Estimates based on models
Preferred temperature (Ref.
123201
): 14.6 - 17.4, mean 15.9 °C (based on 26 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.6250 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01047 (0.00413 - 0.02653), b=3.03 (2.81 - 3.25), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.4 ±0.6 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (10 of 100).
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Page last modified by :
mrius-barile
- 20 July 2016
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